Sky History 2 HD Tuesday

Researchers suggest that the ancient site of Teotihuacan in central Mexico was once home to a highly advanced, perhaps extraterrestrial, civilization

How dozens of megalithic sites across the globe were designed to emanate the exact same frequency allowing humans to connect with extraterrestrial forces

The team investigates a large wooden shipwreck that could be one of the Bermuda Triangle area's earliest victims - the long-lost SS DH Mount

Examining whether a manuscript discovered in the Vatican library in 1994 could be the work of Nostradamus's son, and investigating the likelihood of its chilling prophecy

A humanlike beast with reptilian skin, reportedly terrorising West Virginia for over 50 years. It hovers over its victims in a strange craft, emitting noxious gases

Researchers suggest that the ancient site of Teotihuacan in central Mexico was once home to a highly advanced, perhaps extraterrestrial, civilization

How dozens of megalithic sites across the globe were designed to emanate the exact same frequency allowing humans to connect with extraterrestrial forces

How, if humanity ceased to exist, homes from suburban mansions and Miami condos to rural farmhouses would face a relentless siege by fire, flood, wildlife and time

How the vast and fragile infrastructure hidden underground - from subways and pipelines to one of the big coal seams in the United States - would unravel if humanity vanished

How, in a world without humans, water would turn from life-giver to destroyer, flooding cities, collapsing dams and triggering ancient forces long kept at bay

Scientists explore how Earth would transform if humans vanished, here considering how the global retail machine would collapse

How, in the absence of humanity, the world's most iconic cities - from New York, to Orlando, to Rio de Janeiro - would be reclaimed by nature, as forests rise

A suspicious disappearance in Troy's backyard sends the King of the Swamp deep into the bayou to confront beasts known and unknown

Nasa footage of reported UFOs and alien presence, with comment from former Apollo astronaut Edgar Mitchell, and ex-Nasa contractor Donna Hare

Germany continues to build its empire in Europe, and Hitler seeks to crush Britain with the Luftwaffe

Musketoon Operation, a daring, commando raid on a German-held electricity generating station at Glomfjord in Norway, carried out by British and Norwegian commandos in 1942

Operation Raincoat, a 1943 mission conducted in Italy to break through the German defence line and open the way to and liberate Rome

Researchers suggest that the ancient site of Teotihuacan in central Mexico was once home to a highly advanced, perhaps extraterrestrial, civilization

How dozens of megalithic sites across the globe were designed to emanate the exact same frequency allowing humans to connect with extraterrestrial forces

Nasa footage of reported UFOs and alien presence, with comment from former Apollo astronaut Edgar Mitchell, and ex-Nasa contractor Donna Hare

How, if humanity ceased to exist, homes from suburban mansions and Miami condos to rural farmhouses would face a relentless siege by fire, flood, wildlife and time

How the vast and fragile infrastructure hidden underground - from subways and pipelines to one of the big coal seams in the United States - would unravel if humanity vanished

How, in a world without humans, water would turn from life-giver to destroyer, flooding cities, collapsing dams and triggering ancient forces long kept at bay

Scientists explore how Earth would transform if humans vanished, here considering how the global retail machine would collapse

The Eisenhower Briefing Document, advising President-elect Dwight Eisenhower about top-secret scientists and government officials tasked with investigating reports of UFOs